package com.media.bean.filter;

import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import java.io.IOException;

@WebFilter(filterName = "LoginFilter")
public class LoginFilter implements Filter {
    public void destroy() {
    }

    public void doFilter(ServletRequest req, ServletResponse resp, FilterChain chain) throws ServletException, IOException {
        HttpServletRequest request =(HttpServletRequest) req;
        HttpServletResponse response =(HttpServletResponse) resp;
        HttpSession session = request.getSession();
        if(session.getAttribute("username") !=null || isIgnore(uri)){
            chain.doFilter(request,response);
        }else {
            response.sendRedirect("login.jsp");
        }
    }
private boolean isIgnore(String uri){
        for (String str:ignores){
            if(uri.indexOf(str) != -1){
                return true;
            }
        }
        return false;
}
    public void init(FilterConfig config) throws ServletException {
        String ignore= config.getInitParameter("ignore");
        ignores =ignore.split(",");
    }

}
